Last reported case: 4 years ago
Based on 10 owner reports, 10 from forums)
What is P0171?
P0171 indicates your engine's Bank 1 is running with too much air and not enough fuel, which is called a 'lean' condition. This is a medium-severity powertrain issue that can reduce fuel economy and performance, and it's commonly triggered by vacuum leaks or faulty sensors. Based on 551 reports, repairs for this code average $4596, with Ford Mustangs and F-150s being among the most frequently affected vehicles.
Common Causes:
- Vacuum leaks in intake hoses or gaskets (reported in numerous discussion clusters)
- Faulty mass airflow (MAF) or oxygen (O2) sensors
- Clogged or failing fuel injectors
- Fuel delivery issues like a weak fuel pump or clogged filter
Symptoms:
- Check Engine Light is illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or engine misfires
🚗P0171 on 2010 FORD Expedition
This page focuses specifically on P0171 issues reported by 2010 FORD Expedition owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 FORD Expedition Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 FORD Expedition owners
“The error code given at the time was P0171 which says it’s the Bank 1 MAF sensor or vacuum leak. I’ve replaced the MAF sensor and air filter, then pulled it back off and used the CRC MAF sensor cleaner then reasssmbled it and cleared the code.”View original
“I’ve replaced the MAF sensor and air filter, then pulled it back off and used the CRC MAF sensor cleaner then reasssmbled it and cleared the code. The light came back on the next day and after putting about 100 miles on it and nothing improved.”View original
“Took it to Ford dealership and after a week they came back and said it has jumped timing. They want to charge almost $2000.00 to open up take a look and put back together.”View original
“Do that next and if that doesn't help I would think you still have a vacuum leak. Pay Ford to test it before you spend even more money doing "diagnosis by replacement" if the fuel filter doesn't help.”View original
“The fuel filter is a cheap thing to replace (though it can be a pain, as mentioned above). Do that next and if that doesn't help I would think you still have a vacuum leak.”View original
“Took to my mechanic and he was unable to narrow down the problem. Took it to Ford dealership and after a week they came back and said it has jumped timing.”View original
“Same issue no change just out 50 bucks. Just pulled codes tonight and they are P0301 cyl 1 misfire P0155 02 heat circuit bank 1 sensor 1 P0135 02 heat circuit bank 1 sensor 2 P0303 cyl 3 misfire P0171 bank 1 too lean P0174 bank 2 too lean Just wondering if anyone has had this issue and what was the issue.”View original
“I think I got these codes right, but they equate to Lean on banks one and two. Eventually, I get the codes for Bank 1 & 2 Oxygen sensors lack of switching indicating lean condition.”View original
“Eventually, I get the codes for Bank 1 & 2 Oxygen sensors lack of switching indicating lean condition. When I start this truck up it revs to 2200 rpm and takes a bit to come down.”View original
“I will sometimes have to turn the ignition off and try to restart before it will crank. I have changed the fuel filter but looking to see what else the problem could be.”View original
These are real experiences shared by 2010 FORD Expedition owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 10 discussions about P0171 from 2010 FORD Expedition owners across automotive communities.
Success rate (10%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 3/9/2021